An approach to the construction of indexes of technological change and of technological sophistication: The case of agricultural tractors

Abstract Two indicators of the output of technological innovation have been developed for the case of agricultural tractors. The tractor is a multicharacteristic product, and a fundamental problem in measuring its technological sophistication or technological change is to determine the relative weights of different characteristics. These relative weights have been approximated by the coefficients of a regression of tractor price with respect to tractor technical characteristics. The indicators developed allow one to measure technical change over time or the relative technical sophistication of different tractor models or tractor firms at a given moment. These indicators can be applied only to multicharacteristic products with easily quantifiable characteristics. However, products that satisfy these requirements account for a very large share of the market for industrial goods. These indicators can be useful in assessing the efficiency of R&D, in analyzing the influence of technological innovation on patterns of trade, and in determining the contribution of changes in the quality of capital goods employed to increases in industrial productivity.